Has been tested and developed using:

ubuntu 16.04.6
openssl: 1.0.2g
node: 8.16.0

Requirements:

curl -sL https://deb.nodesource.com/setup_8.x | sudo -E bash -
sudo apt-get install -y nodejs
sudo apt-get install -y build-essential
install python 2.7
rm package-lock.json && rm -rf node_modules && rm -rf ~/.node-gyp only (if package-lock.json/node_modules or node was installed)
sudo apt-get install libasound2-dev
sudo npm i -g node-gyp
sudo npm install --unsafe-perm

Configuration:

For the simulation to simulate in a period, we must put the testing_period setting in settings (the value is in milliseconds)
Example in config:

[settings]
max_fails = 3
send_voice = true
send_gps = true
gps_report_interval = 10000
gps_lng_start_point = 24.776126
testing_period = 7000 # we will simulate all the units in a period of 7 seconds

Start

node index.js --path="./config/stage" node ./index.js --path="./config/testing"